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@ 2014-03-17T15:50:11Z

<?php
$list = array(
  array('hostname' => 'example.org'),
  array('hostname' => 'www.example.org'),
  array('hostname' => 'example.example.org'),
);

$keys = array_column($list, 'hostname');
var_dump($keys);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_column: documentation ( source)

preferences:dark modelive preview

63.16 ms | 402 KiB | 5 Q